Telephone-receiver



PATENTED HIB. 2,A 1904;.,

L.sANDs & c. c. GADDEN. TELEPHoLLn-.REGB1VBR- l APPLIOATION FILED HAB.. 6. 1903. v l I No MODEL,

III?

WI E55 a5 UNITED ASTATES Patented February Q, d..

PATENT OFFICE.

LEWIS SANDS AND CHARLES C. CADDEN, OF CLEVELAND, OHIO,

CLEVELAND, OHIO.

TELePHoNEv-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 751,344, dated February 2, 1904.

Application iilcd March 6, 1903.

To cti/Z whom, t may concern:

Be it known that we, LEWTs SANDS and CHARLES C. CADDEN, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and vState of Ohio, have invented a certain new and useful Improvement in rIelephone-Receivers, of which the following is a l full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specication.

Our invention relates to telephone-receiv-- particularly to Vthat class of telephone-receivers into the interior of -which the receiver-cord is led, which receiver-cord has connections with` the terminals of the receivers electromagnet upon the interior of thereceiver-casing. Hitherto in instruments of this type the terminals of the receiver-cord would be subject to vany strain that would be occasioned in suspending the receiver by its cord. Our invention in this respect resides in providing the attachment between the cord and a portion of the contents within the receiveroasing rather than with the receivercasing directly, `as hitherto. The latter construction is not at all adapted to receivers of the class specified unless metal parts are provided upon the exterior thereof, which is objectionable. In other words, this feature of the invention consists in forming a mechanical lattachment between the receiver-cord and the receiver proper rather than between the telephone-cord and the casingforthe receiver proper. The portion of the receiver proper with which such mechanical connection is effected is preferably the permanent magnet, and the attachment preferably comprises a the cord.

Serial No. 146,586. (No model.)

ringor loop through which the permanent 'teri'or of the receiver-casing and comprises a supporting-block provided with apertures in which are permanently mounted terminals of thereceivers electromagnet in combination with the tag ends of the receiver-cord, that are adapted to be slipped into these recesses to have electricalconnections with the said terminals, screws being desirably employed for forcing tight engagement between the said terminals and the tags. These terminals within the said recesses are desirably in the form of sleeves or tubes, into the interior of which the correspondingly-shaped tag endsv of the receiver-cord areY adapted to be inserted, apertures transverse to the said sleeves being provided in the support thereof and in the sleeves, so that the binding-screws may be forced into the interior of the sleeves to 'engage the tag ends to effect the desired intimacy of contact, other apertures being provided in the support for the said sleeve-tervinitials, through which wires from the electromagnet are passed, these nwires being soldered or otherwise electrically united with the said sleeves.

Another feature of our "invention is adaptable for use in connection with receivers of l various types and is designed to 4furnish a substantially fixed adjustment between the receivers diaphragm and the poles of the receivers electromagnet without the appear- 'ance of metal adjusting parts Vupon the eX- terior offthe casing to any material e-Xtent. As 1s well known, a receiver-casing usually comprises a rubber casing formed in two parts, the body portion and the ear-cap in threaded engagement therewith. In adevice of our invention threaded engagement of the ear-cap with thebody portion of the casing is avoided by having this ear-cap placed in threaded engagement with a follower-ring employed to clamp the diaphragm in place. r1`he follower-ring is preferably threaded upon its interior and exterior peripheries, it having threaded engagement at its exterior with the body of the receiver-casing and threaded engagement at its interior with the ear-cap. The ear-cap is preferably so shaped that it will engage the body of the receiver-casing at the periphery of the ear-cap, the contour of the cap and the casing-body being preferably such as to make the cap and body appear as of integral formation.

The features of our invention are improvements upon the receiver disclosed in the application of Charles C. Cadden, Serial No. 59,497, filed May 9, 1901.

l/Ve will explain our invention more fully by reference to the accompanying drawings, in which Figure 1 is a longitudinal section of a receiver constructed in accordance With our invention, parts being shown in elevation to indicate clearly features of construction. Fig. 2 is a sectional plan view on line 2 2 of Fig. 1. Fig. 3 is a cross-sectional view on line 3 3 of Fig. 1. Fig. 4 is a side elevation showing a portion of the receivers permanent magnet and the mechanical attachment between the same and the serving of the receivers cord. Fig. 5 is an end view of the receiver with the earpiece removed.

Like parts are indicated by similar characters of reference throughout the different figures.

The body portion a of the receiver-casing has an aperture centrally disposed at its upper end for the reception of the receivercord c, the cord having two branches d Z provided with individual servings and separated within the casing and mechanically united under a common serving, as shown, on the exterior of the receiver-casing. The receiver proper comprises a permanent magnet e, an electromagnet f, and attached by its cores g f/ to the permanent magnet, a cup 4/L providing a seat f2; for the diaphragm r, the clamping' or follower ring Zand the base portion m of the body a serving as means for mechanically uniting the said diaphragm and ring. The balance of the receiver-casing and the earpiece n do not constitute portions of the receiver proper, buta casing or shell therefor.

Our invention in some of its aspects relates tothe construction of the receiver proper in combination with the casing therefor and means for effecting connection with thetelephone-cord without placing' any dependence mechanically upon the casing. To this end the magnet e, which is desirably of horseshoe shape, has united therewith a supportingblock 0, made desirably of rubber or other insulating material, which is provided with recesses extending longitudinally thereof, in which recesses are disposed terminals 7J p, desirably in the form of sleeves, and which constitute the permanent terminals of the electromagnetf, whose terminal conductors r] g are soldered or otherwise permanently secured to the said sleeves. r1`he cords Z d are provided With metal tags 9 0, that slip within the sleeves and are secured thereto by means of clamping-screws s3, which desirably have their engagement not only with the su pportingblock 0, but also with transverse apertures provided in the sleeves. By the construction shown the main elements of the receiver may be completely assembled before the receiver casing is supplied.

In order that the connections of the cords (Z Z with the terminals of the electromagnetf may not be impaired by any strain imposed upon the exterior portion of the cord, an attachment is aforded between the receiver proper and the servings of the cord, which attachment desirably comprises a ring t, through which the permanent magnet is loosely passed, and a double loop s', through which the ring1 is passed, and which is sewed to the serving of the cord at s2. The branches (Z (Z of the cord are made sufficiently long so that when the mechanical connection between the cord and the permanent magnet is made taut there will be no strain upon the said branches. Referring now to the lower portion of the structure, the cup /L and the permanent magnet are united by a block u, the fastening-bolt e passing through the said block, the'limbs of the permanent magnet, and the cores g, the conductors g passing through apertures provided in the cup L into permanent connections with the terminals p. rl`he block o is desirably secured in place by screw connections w with the block u, as indicated in Fig. 1. The clamping-ring l is threaded upon its interior and exterior, the earpiece 'a having an interior shoulder .fr engaging the interior of the ring and having an annular iange j//, which desirably projects beyond the ring Z into direct engagement with the body a. The ring Z thus performs the double function of securing the diaphragm in place and of constituting' the support for the earpiece, which may .thus be made to appear as an integral part With the body a, if desired.

Itis obvious that many changes may be made in the precise form of the invention illustrated without departing from the spirit of the invention, and we do not, therefore, wish to be limited to the precise construction set forth.

Having thus described our invention, we claim as new and desire to secure by Letters Patentr- IOO ITO

1. In a telephone-receiver, the combination With the casing thereof, of a cord therefor passing freely through the casing, a support of insulating material carried by the receiver Within the casing, the said support having apertures, terminals Within the said apertures, the said support having a second set of apertures through which terminal Wires of the receivers electromagnet are passed into permanent connection. with the terminals Within the first aforesaid apertures, the receivers cord being of apertures through which terminal Wires ofthe receivers electromagnet are passed into permanent connection with the terminals Within the first-aforesaid apertures, the receivers cord being .provided with end tags adapted for insertion Within the `said apertures and electrical connection With the terminals therein,

the receivers casing and a cup /t supporting at its bottom the magnet of the receiver and carrying the seatz' for the diaphragm, said cup and diaphragm being both held upon the casing of the receiver, substantially as described.

4. In a telephone-receiver, the combination With the casing thereof, of a cord therefor passing freely through the casing, a support of insulating material carried bythe receiver Within the casing, the said support having apertures, terminals Within the said apertures, the said support having a second set of apertures through which terminal Wires of the receivers electromagnet are passed into connection With the terminals Within the irst-aforesaid apertures, the receivers cord being provided With end tags adapted for insertion Within the said apertures and electrical connection with the terminals therein,and binding-screws passing through the supporting-block into engagement With the end tags of the cord, substantially as described.

5. In atelephone-receiver, .the combination With the casing thereof,lof a cord therefor passing freely through the casing, a support of insulating material carried by the receiver Within the casing, the said support having apertures, ofterminal sleeves Within said apertures, the said support having a second set of apertures through Which terminal Wires of the receiver?s electromagnet are passed into connection with the; terminals Within the firstaforesaid apertures, the receivers cord being provided with end tags adapted for insertion Within the said apertures and electrical connection with the terminals therein, and binding-screws passing through apertures in the supporting insulatingmaterial and the said sleeves into engagement With the end tags of the cord, substantially as described.

6. In a telephone-receiver, the combination with the casing thereof inclosing a receiver, of a receiver-cord extending freely through the receiver-casing and attached Within the casing to the terminals of the receivers electro= magnet, a ring through which the permanent magnet of the receiver is passed, and a loop through Whichthe ring is passed, the 4said loop being attached to the cord to relieve the terminals of the cord Within the casing of strain, substantially as described.

In Witness whereof We hereunto subscribe our names this 19th day of February, A. D.

F. H. LINCOLN, E. G. GAYLORD. 

